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Pension and Postretirement Benefit Plans - Schedule of Components of Net Periodic Cost and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Postretirement Benefits        
Operating expense        
Service cost $ 1 $ 1 $ 1 $ 2
Non-operating expense        
Interest cost 3 3 6 6
Expected return on plan assets (2) (2) (4) (4)
Amortization of prior service benefit     (1) 0
Amortization of net actuarial loss 1 1 1 2
Non-operating 1 2 2 4
Total net periodic benefit cost (benefit) 2 3 3 6
United States | Qualified and Non-qualified Pension Benefits        
Operating expense        
Service cost 6 6 12 12
Non-operating expense        
Interest cost 23 24 46 48
Expected return on plan assets (32) (31) (63) (62)
Amortization of prior service benefit     0 0
Amortization of net actuarial loss 16 16 31 32
Non-operating 7 9 13 18
Total net periodic benefit cost (benefit) 13 15 25 30
International | Qualified and Non-qualified Pension Benefits        
Operating expense        
Service cost 4 5 9 10
Non-operating expense        
Interest cost 6 5 11 10
Expected return on plan assets (6) (6) (12) (12)
Amortization of prior service benefit     0 0
Amortization of net actuarial loss 0 0 0 0
Non-operating (1) (1) (1) (2)
Total net periodic benefit cost (benefit) $ 4 $ 4 $ 7 $ 8